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I'd also I'd say just go for it. If the mounts are out somewhere, it'll be less than 2mm. The cases and cylinder have used the same casting from 06 to 12. The width of the gap between the swingarm might need some mod.

Maybe keep it simple+light and put the 09 motor in your 08, but use you carb and CDI. The only thing I'd be unsure about is the stator to CDI compatibility.

BTW: If you want some more grunt on small throttle opening, then get the 06 CDI.